CN112175285A - Preparation method of heat-shrinkable film capable of reducing carbon emission - Google Patents
Preparation method of heat-shrinkable film capable of reducing carbon emission Download PDFInfo
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- CN112175285A CN112175285A CN202010750482.8A CN202010750482A CN112175285A CN 112175285 A CN112175285 A CN 112175285A CN 202010750482 A CN202010750482 A CN 202010750482A CN 112175285 A CN112175285 A CN 112175285A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a preparation method of a heat shrinkable film capable of reducing carbon emission, which comprises the steps of melting and extruding a bio-based LLDPE, a slipping agent, a polypropylene copolymer and an opening agent; then carrying out water cooling shaping, traction, heating, inflation air cooling shaping, bubble collapse flattening, cutting, rolling and warehousing; wherein the bio-based LLDPE is a biological source such as sugarcane, and the using amount of the bio-based LLDPE accounts for 15-70% of the total raw material mass; compared with the heat-shrinkable film taking petroleum polyethylene as a raw material, the prepared heat-shrinkable film capable of reducing carbon emission can reduce the carbon emission by 15-70%, and is equivalent to the saving of 300-1400 liters of gasoline calculated by 2.3 liters of carbon dioxide generated by the combustion of 1 liter of gasoline. The thermal shrinkage film prepared by the invention can obviously reduce carbon emission, meets the requirements of ecological development and green development, can greatly reduce the link greenhouse effect, and has wide market prospect.
Description
Technical Field
The invention belongs to the technical field of heat-shrinkable films, and particularly relates to a preparation method of a heat-shrinkable film capable of reducing carbon emission.
Background
The heat shrinkable film has various advantages of high transparency, high shrinkage, high toughness, high heat sealing performance, excellent cold resistance and the like, and is widely applied to outer packaging and integrated packaging of products in various industries such as food, cosmetics, gifts, medicines, stationery, toys, audio-visual products, electronics, wood products, plastic hardware, daily necessities and the like. However, the common heat shrinkable film material is polyethylene PE which is difficult to degrade from petroleum, and causes great pressure on the environment. The traditional incineration treatment can cause a large amount of carbon dioxide emission, and the influence of the greenhouse effect is aggravated. With increasing environmental importance, the sound of heat shrinkable films capable of reducing carbon emissions is increasing.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned technical drawbacks.
Therefore, as one aspect of the present invention, the present invention overcomes the disadvantages of the prior art and provides a method for preparing a heat shrinkable film capable of reducing carbon emissions.
In order to solve the technical problems, the invention provides the following technical scheme: a preparation method of a heat shrinkable film capable of reducing carbon emission comprises the steps of melting and extruding a bio-based LLDPE, a slipping agent, a polypropylene copolymer and an opening agent; then carrying out water cooling shaping, traction, heating, inflation air cooling shaping, bubble collapse flattening, cutting, rolling and warehousing; wherein the bio-based LLDPE is a biological source such as sugarcane, and the using amount of the bio-based LLDPE accounts for 15-70% of the total raw material mass; compared with the heat-shrinkable film taking petroleum polyethylene as a raw material, the prepared heat-shrinkable film capable of reducing carbon emission can reduce the carbon emission by 15-70%, and is equivalent to the saving of 300-1400 liters of gasoline calculated by 2.3 liters of carbon dioxide generated by the combustion of 1 liter of gasoline.
As a preferable scheme of the preparation method of the heat shrinkable film capable of reducing carbon emission, the method comprises the following steps: the extrusion is realized by co-extrusion of 3 layers or more.
As a preferable scheme of the preparation method of the heat shrinkable film capable of reducing carbon emission, the method comprises the following steps: the slipping agent comprises one or more of low-density polyethylene LDPE resin, erucamide and oleamide.
As a preferable scheme of the preparation method of the heat shrinkable film capable of reducing carbon emission, the method comprises the following steps: the melting is carried out at 170-230 ℃.
As a preferable scheme of the preparation method of the heat shrinkable film capable of reducing carbon emission, the method comprises the following steps: melting raw materials of all layers in a single-screw extruder respectively, converging and co-extruding to obtain a multilayer composite sheet, carrying out water-cooling shaping, traction, heating, inflation air-cooling shaping, bubble-removing flattening, cutting, rolling and warehousing on the multilayer composite sheet.
As a preferable scheme of the preparation method of the heat shrinkable film capable of reducing carbon emission, the method comprises the following steps: and heating, sectioning and rolling the flattened bubble.
As a preferable scheme of the preparation method of the heat shrinkable film capable of reducing carbon emission, the method comprises the following steps: the heating is infrared heating.
As a preferable scheme of the preparation method of the heat shrinkable film capable of reducing carbon emission, the method comprises the following steps: the heating further comprises electron beam heating.
As another aspect of the present invention, the present invention provides a heat-shrinkable film capable of reducing carbon emissions, wherein: the heat shrinkable film capable of reducing carbon emission can reduce carbon emission by more than 50%.
As a preferable embodiment of the heat-shrinkable film capable of reducing carbon emission according to the present invention, wherein: the heat shrinkable film capable of reducing carbon emission can reduce carbon emission by more than 70%.
The invention has the beneficial effects that:
the thermal shrinkage film prepared by the invention can obviously reduce carbon emission, meets the requirements of ecological development and green development, can greatly reduce the link greenhouse effect, and has wide market prospect.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with examples are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1: three-layer co-extrusion film blowing method
Weighing raw materials of each layer according to the total raw materials, specifically comprising the following raw materials in a first outer layer: 10% -18% pp and 1% -3% of a mouth-opening agent; the middle layer comprises the following raw materials: 15% -70% sugarcane extract LLDPE (purchased from brakebraskem corporation) + 60% -0% petroleum extract LLDPE + 1-5% slip agent; 10-18% of pp + 1-3% of a second outer layer raw material.
Respectively adding three layers of raw materials into a single screw for melting, melting at 180-195 ℃, supplying different molten material flows by using three single screws, converging and co-extruding in a three-layer co-extrusion die head (the temperature is 180-195 ℃) to obtain a multi-layer composite sheet, performing water cooling setting by using a water cooling machine, guiding a film into a drying machine by using a tractor, performing secondary traction after traction, heating, blowing, air cooling and setting, expanding bubbles, flattening (guiding the film into a preheating machine by the tractor, performing bidirectional stretching after preheating), cutting, rolling and warehousing. Wherein the heating is infrared heating, the radiation wavelength of the infrared heating is 20-30 microns, and the plastic tube blank is heated to a high elastic state of 113-115 ℃;
common 1 ton petroleum polyethylene, 4.47T CO carbon emission2Emission, example 1 film, 1 ton carbon emission 1.26T CO2And (3) emission, namely, the carbon emission is reduced by 70 percent, which is equivalent to saving 1400 liters of gasoline. 1 liter of gasoline burns producing 2.3 liters of emissions.
Example 2: five-layer coextrusion blown film method
Weighing each layer of raw materials according to the total raw materials, wherein the first and second outer layer raw materials are as follows: 10-18% pp + 1-3% of a mouth-opening agent. The middle three layers of raw materials are total: 15-70% of sugarcane LLDPE, 60-0% of petroleum refining LLDPE and 1-5% of slipping agent, and are uniformly distributed.
Respectively adding raw materials of each layer into a single screw for melting, melting at 180-195 ℃ for 5 times, supplying different molten material flows by using 5 single screws, converging and co-extruding in a three-layer co-extrusion die head (the temperature is 180-195 ℃) to obtain a multi-layer composite sheet, performing water cooling setting by using a water cooling machine, guiding a film into a drying machine by using a traction machine, performing secondary traction, heating, inflation air cooling setting, bubble collapse flattening (guiding the film into a preheating machine by the traction machine, preheating, performing bidirectional stretching), cutting, rolling and warehousing. Wherein the heating is infrared heating, the radiation wavelength is 20-30 microns, and the plastic tube blank is heated to a high elastic state of 113-115 ℃.
Example 3: three-layer co-extrusion film blowing method
Weighing raw materials of each layer according to the total raw materials, specifically comprising the following raw materials in a first outer layer: 10-18% pp + 1-3% of a mouth-opening agent; the middle layer comprises the following raw materials: 15-70% of cane extract LLDPE, 60-0% of petroleum extract LLDPE and 1-5% of slipping agent; 10-18% of pp + 1-3% of a second outer layer raw material.
Respectively adding three layers of raw materials into a single screw for melting, melting at 180-195 ℃, supplying different molten material flows by using three single screws, converging and co-extruding in a three-layer co-extrusion die head (the temperature is 180-195 ℃) to obtain a multi-layer composite sheet, performing water cooling setting by using a water cooling machine, guiding a film into a drying machine by using a tractor, performing secondary traction after traction, heating, blowing, air cooling and setting, expanding bubbles, flattening (guiding the film into a preheating machine by the tractor, performing bidirectional stretching after preheating), cutting, rolling and warehousing. Wherein the heating is infrared heating and then electron beam heating, the radiation wavelength of the infrared heating is 20-30 microns, and the plastic tube blank is heated to a high elastic state of 113-115 ℃; the electron beam heating equipment is a low-energy electron beam heater, the radiation dose is 75kGy, the speed of an irradiation window passing through the low-energy electron beam heater is 0.3m/s, the acceleration voltage is 100keV, the dose is uniformly distributed at the depth of 30 mu m, and air purging is carried out during irradiation.
Example 4: three-layer co-extrusion film blowing method
Weighing raw materials of each layer according to the total raw materials, specifically comprising the following raw materials in a first outer layer: 10-18% pp + 1-3% of a mouth-opening agent; the middle layer comprises the following raw materials: 15-70% of cane extract LLDPE, 60-0% of petroleum extract LLDPE and 1-5% of slipping agent; 10-18% of pp + 1-3% of a second outer layer raw material.
Respectively adding three layers of raw materials into a single screw for melting, melting at 180-195 ℃, supplying different molten material flows by using three single screws, converging and co-extruding in a three-layer co-extrusion die head (the temperature is 180-195 ℃) to obtain a multi-layer composite sheet, performing water cooling setting by using a water cooling machine, guiding a film into a drying machine by using a tractor, performing secondary traction after traction, heating, blowing, air cooling and setting, expanding bubbles, flattening (guiding the film into a preheating machine by the tractor, performing bidirectional stretching after preheating), cutting, rolling and warehousing. Wherein the heating is infrared heating and then electron beam heating, the radiation wavelength of the infrared heating is 20-30 microns, and the plastic tube blank is heated to a high elastic state of 115-118 ℃; the electron beam heating equipment is a low-energy electron beam heater, the radiation dose is 65kGy, the speed of an irradiation window passing through the low-energy electron beam heater is 0.2m/s, the acceleration voltage is 100keV, the dose is uniformly distributed at the depth of 25 mu m, and air purging is carried out during irradiation.
Example 5: five-layer coextrusion blown film method
Weighing each layer of raw materials according to the total raw materials, wherein the first and second outer layer raw materials are as follows: 10-18% pp + 1-3% of a mouth-opening agent. The middle three layers of raw materials are total: 15-70% of sugarcane LLDPE, 60-0% of petroleum refining LLDPE and 1-5% of slipping agent, and are uniformly distributed.
Respectively adding raw materials of each layer into a single screw for melting, melting at 180-195 ℃ for 5 times, supplying different molten material flows by using 5 single screws, converging and co-extruding in a three-layer co-extrusion die head (the temperature is 180-195 ℃) to obtain a multi-layer composite sheet, performing water cooling setting by using a water cooling machine, guiding a film into a drying machine by using a traction machine, performing secondary traction, heating, inflation air cooling setting, bubble collapse flattening (guiding the film into a preheating machine by the traction machine, preheating, performing bidirectional stretching), cutting, rolling and warehousing. Wherein the heating is infrared heating and then electron beam heating, the radiation wavelength of the infrared heating is 20-30 microns, and the plastic tube blank is heated to a high elastic state of 113-115 ℃; the electron beam heating equipment is a low-energy electron beam heater, the radiation dose is 70kGy, the speed of an irradiation window passing through the low-energy electron beam heater is 0.3m/s, the acceleration voltage is 100keV, the dose is uniformly distributed at the depth of 35 mu m, and air purging is carried out during irradiation.
Example 6: five-layer coextrusion blown film method
Weighing each layer of raw materials according to the total raw materials, wherein the first and second outer layer raw materials are as follows: 10-18% pp + 1-3% of a mouth-opening agent. The middle three layers of raw materials are total: 15-70% of sugarcane LLDPE, 60-0% of petroleum refining LLDPE and 1-5% of slipping agent, and are uniformly distributed.
Respectively adding raw materials of each layer into a single screw for melting, melting at 180-195 ℃ for 5 times, supplying different molten material flows by using 5 single screws, converging and co-extruding in a three-layer co-extrusion die head (the temperature is 180-195 ℃) to obtain a multi-layer composite sheet, performing water cooling setting by using a water cooling machine, guiding a film into a drying machine by using a traction machine, performing secondary traction, heating, inflation air cooling setting, bubble collapse flattening (guiding the film into a preheating machine by the traction machine, preheating, performing bidirectional stretching), cutting, rolling and warehousing. Wherein the heating is infrared heating and then electron beam heating, the radiation wavelength of the infrared heating is 40-50 microns, and the plastic pipe blank is heated to a high elastic state of 115-118 ℃.
Example 7: three-layer co-extrusion film blowing method
Weighing raw materials of each layer according to the total raw materials, specifically comprising the following raw materials in a first outer layer: 10-18% pp + 1-3% of a mouth-opening agent; the middle layer comprises the following raw materials: 15-70% of cane extract LLDPE, 60-0% of petroleum extract LLDPE and 1-5% of slipping agent; 10-18% of pp + 1-3% of a second outer layer raw material.
Respectively adding three layers of raw materials into a single screw for melting, melting at 180-195 ℃, supplying different molten material flows by using three single screws, converging and co-extruding in a three-layer co-extrusion die head (the temperature is 180-195 ℃) to obtain a multi-layer composite sheet, performing water cooling setting by using a water cooling machine, guiding a film into a drying machine by using a tractor, performing secondary traction after traction, heating, blowing, air cooling and setting, expanding bubbles, flattening (guiding the film into a preheating machine by the tractor, performing bidirectional stretching after preheating), cutting, rolling and warehousing. Wherein the heating is infrared heating and then electron beam heating, the radiation wavelength of the infrared heating is 30-40 microns, and the plastic tube blank is heated to a high elastic state of 115-118 ℃; the electron beam heating equipment is a low-energy electron beam heater, the radiation dose is 85kGy, the speed of an irradiation window passing through the low-energy electron beam heater is 0.2m/s, the acceleration voltage is 100keV, the dose is uniformly distributed at the depth of 25 mu m, and air purging is carried out during irradiation.
Example 8: three-layer co-extrusion film blowing method, and sugarcane extraction process
Weighing raw materials of each layer according to the total raw materials, specifically comprising the following raw materials in a first outer layer: 10-18% pp + 1-3% of a mouth-opening agent; the middle layer comprises the following raw materials: 15% -70% of sugarcane extraction LLDPE (purchased from LEGO, Denmark), 60% -0% of petroleum extraction LLDPE and 1-5% of slipping agent; 10-18% of pp + 1-3% of a second outer layer raw material.
Respectively adding three layers of raw materials into a single screw for melting, melting at 180-195 ℃, supplying different molten material flows by using three single screws, converging and co-extruding in a three-layer co-extrusion die head (the temperature is 180-195 ℃) to obtain a multi-layer composite sheet, performing water cooling setting by using a water cooling machine, guiding a film into a drying machine by using a traction machine, performing secondary traction after traction, heating, blowing, air cooling and setting, bubble flattening (guiding the film into a preheating machine by the traction machine, performing bidirectional stretching after preheating), heating by using electron beams, cutting, rolling and warehousing.
The results of the tests of the heat shrinkable films obtained in examples 1 to 8 are shown in Table 1.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A preparation method of a heat shrinkable film capable of reducing carbon emission is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
melting and extruding the bio-based LLDPE, the slipping agent, the co-polypropylene and the opening agent;
then carrying out water cooling shaping, traction, heating, inflation air cooling shaping, bubble collapse flattening, cutting, rolling and warehousing;
wherein the bio-based LLDPE is a biological source such as sugarcane, and the using amount of the bio-based LLDPE accounts for 15-70% of the total raw material mass; compared with the heat-shrinkable film taking petroleum polyethylene as a raw material, the prepared heat-shrinkable film capable of reducing carbon emission can reduce the carbon emission by 15-70%, and is equivalent to the saving of 300-1400 liters of gasoline calculated by 2.3 liters of carbon dioxide generated by the combustion of 1 liter of gasoline.
2. The method for preparing a heat-shrinkable film capable of reducing carbon emissions according to claim 1, wherein: the extrusion is realized by co-extrusion of 3 layers or more.
3. The method for preparing a heat-shrinkable film capable of reducing carbon emissions according to claim 1, wherein: the slipping agent comprises one or more of low-density polyethylene LDPE resin, erucamide and oleamide.
4. The method for preparing a heat-shrinkable film capable of reducing carbon emission according to claim 3, wherein: the melting is carried out at 170-230 ℃.
5. The method for preparing a heat-shrinkable film capable of reducing carbon emissions according to claim 2, wherein: melting raw materials of all layers in a single-screw extruder respectively, converging and co-extruding to obtain a multilayer composite sheet, carrying out water-cooling shaping, traction, heating, inflation air-cooling shaping, bubble-removing flattening, cutting, rolling and warehousing on the multilayer composite sheet.
6. The method for preparing a heat-shrinkable film capable of reducing carbon emission according to claim 5, wherein: and heating, sectioning and rolling the flattened bubble.
7. The method for preparing a heat-shrinkable film capable of reducing carbon emissions according to claim 6, wherein: the heating is infrared heating.
8. The method for preparing a heat-shrinkable film capable of reducing carbon emissions according to claim 7, wherein: the heating further comprises electron beam heating.
9. A heat shrinkable film capable of reducing carbon emission according to any one of claims 1 to 8, wherein: the heat shrinkable film capable of reducing carbon emission can reduce carbon emission by more than 50%.
10. The method for preparing a heat-shrinkable film capable of reducing carbon emissions according to claim 9, wherein: the heat shrinkable film capable of reducing carbon emission can reduce carbon emission by more than 70%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114989518A (en) * | 2022-07-27 | 2022-09-02 | 新乐华宝塑料薄膜有限公司 | Biological polyethylene film and preparation method thereof |
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| CN111070611A (en) * | 2019-12-31 | 2020-04-28 | 上海森韦得实业有限公司 | Preparation method of anti-aging polyolefin heat-shrinkable film |
| JP2020079118A (en) * | 2020-02-12 | 2020-05-28 | 大日本印刷株式会社 | Sealant film for packaging medium using plant-derived polyethylene, laminated film for packaging medium, and packaging bag |
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| CN114989518A (en) * | 2022-07-27 | 2022-09-02 | 新乐华宝塑料薄膜有限公司 | Biological polyethylene film and preparation method thereof |
| CN114989518B (en) * | 2022-07-27 | 2022-11-04 | 新乐华宝塑料薄膜有限公司 | Biological polyethylene film and preparation method thereof |
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